c.bu...@posteo.jp writes:

> This is not a support question about how to solve a problem or the error
> message I do report here. It is a request to improve that error message
> to help users understand the real problem and find a solution by their
> own.
>
> I get the this error message in context when using the Org attachments
> feature (C-c C-a plus c).
>
>      "org-back-to-heading: Before first headline at position 1 in 
> buffer..."

I believe that this problem have been fixed on main.
If not, please provide more details on how to trigger the error.

> using the first time this Emacs in build bug report thing. But have to 
> send the mail via copy & paste because the bug reporter didn't work out 
> of the box.
> The "From" field is not valid. Modified it manually in the buffer. But 
> didn't work.
> Emacs tried to use STARTTLS with posteo.de:25 which is wrong I think. 
> Should be port 587 but don't know how to set this.

Something is off in your email settings (in emacs or in system mailer).

-- 
Ihor Radchenko // yantar92,
Org mode contributor,
Learn more about Org mode at <https://orgmode.org/>.
Support Org development at <https://liberapay.com/org-mode>,
or support my work at <https://liberapay.com/yantar92>

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